CVE-2021-20231
criticalA flaw was found in gnutls.
Vendor / product: Gnu — gnutls
A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.
CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2021-03-12 19:15
Modified: 2026-10-14 11:16
NVD status: Modified
Last synced 2 days ago
Verified against the source API 2026-10-27 07:06 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
gnu / gnutls ≥3.6.3 <3.7.1
redhat / enterprise_linux 8.0
fedoraproject / fedora 34
netapp / active_iq_unified_manager all versions
netapp / e-series_performance_analyzer all versions
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://www.gnutls.org/security-new.html#GNUTLS-SA-2021-03-10
Vendor advisory: https://www.gnutls.org/security-new.html#GNUTLS-SA-2021-03-10
Patch / mitigation: https://bugzilla.redhat.com/show_bug.cgi?id=1922276
Patch / mitigation: https://bugzilla.redhat.com/show_bug.cgi?id=1922276
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1922276 secalert@redhat.com
- https://lists.apache.org/thread.html/r50661d6f0082709aad9a584431b59ec364f9974b63b07e080023... secalert@redhat.com
- https://lists.apache.org/thread.html/r5d4001031e7790d8c6396c499522b4ed2aab782da87b1a141847... secalert@redhat.com
- https://lists.apache.org/thread.html/r5f88bed447742fcc5c47bf1c7be965ef450131914a6e1f85feba... secalert@redhat.com
- https://lists.apache.org/thread.html/r6ac143ba6dd98bd4bf6bf010d46e56e254056459721ba18822d6... secalert@redhat.com
- https://lists.apache.org/thread.html/r9cbc69e57276413788e90a6ee16c7c034ea4258d31935b70db2b... secalert@redhat.com
- https://lists.apache.org/thread.html/rcd70a4c88a47a75fd2d5f3ffb7cee8c2a18c713320bd90fdcb57... secalert@redhat.com
- https://lists.apache.org/thread.html/rf5e1256d870193def4a82ad89ab95e63943a313b5ff0d81aa87e... secalert@redhat.com
- https://lists.apache.org/thread.html/rfd5273d72d244178441e6904a2f2b41a3268f569e8092ea0b3b2... secalert@redhat.com
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/m... secalert@redhat.com
- https://security.netapp.com/advisory/ntap-20210416-0005/ secalert@redhat.com
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2021-03-10 secalert@redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=1922276 af854a3a-2127-422b-91ae-364da2661108
- https://lists.apache.org/thread.html/r50661d6f0082709aad9a584431b59ec364f9974b63b07e080023... af854a3a-2127-422b-91ae-364da2661108
- https://lists.apache.org/thread.html/r5d4001031e7790d8c6396c499522b4ed2aab782da87b1a141847... af854a3a-2127-422b-91ae-364da2661108
- https://lists.apache.org/thread.html/r5f88bed447742fcc5c47bf1c7be965ef450131914a6e1f85feba... af854a3a-2127-422b-91ae-364da2661108
- https://lists.apache.org/thread.html/r6ac143ba6dd98bd4bf6bf010d46e56e254056459721ba18822d6... af854a3a-2127-422b-91ae-364da2661108
- https://lists.apache.org/thread.html/r9cbc69e57276413788e90a6ee16c7c034ea4258d31935b70db2b... af854a3a-2127-422b-91ae-364da2661108
- https://lists.apache.org/thread.html/rcd70a4c88a47a75fd2d5f3ffb7cee8c2a18c713320bd90fdcb57... af854a3a-2127-422b-91ae-364da2661108
- https://lists.apache.org/thread.html/rf5e1256d870193def4a82ad89ab95e63943a313b5ff0d81aa87e... af854a3a-2127-422b-91ae-364da2661108
- https://lists.apache.org/thread.html/rfd5273d72d244178441e6904a2f2b41a3268f569e8092ea0b3b2... af854a3a-2127-422b-91ae-364da2661108
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/m... af854a3a-2127-422b-91ae-364da2661108
- https://security.netapp.com/advisory/ntap-20210416-0005/ af854a3a-2127-422b-91ae-364da2661108
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2021-03-10 af854a3a-2127-422b-91ae-364da2661108
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:06 UTC · record ↗